module OnForm::MultiparameterAttributes
Public Instance Methods
assign_multiparameter_attributes(pairs)
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Instantiates objects for all attribute classes that needs more than one constructor parameter. This is done by calling new on the column type or aggregation type (through composed_of) object with these parameters. So having the pairs written_on(1) = “2004”, written_on(2) = “6”, written_on(3) = “24”, will instantiate written_on (a date type) with Date.new(“2004”, “6”, “24”). You can also specify a typecast character in the parentheses to have the parameters typecasted before they're used in the constructor. Use i for Integer and f for Float. If all the values for a given attribute are empty, the attribute will be set to nil
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# File lib/on_form/rails_compat.rb, line 13 def assign_multiparameter_attributes(pairs) execute_callstack_for_multiparameter_attributes( extract_callstack_for_multiparameter_attributes(pairs) ) end
execute_callstack_for_multiparameter_attributes(callstack)
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# File lib/on_form/rails_compat.rb, line 19 def execute_callstack_for_multiparameter_attributes(callstack) errors = [] callstack.each do |name, values_with_empty_parameters| begin if defined?(ActiveRecord::AttributeAssignment::MultiparameterAttribute) # ActiveRecord 4.2 and below: you must use MultiparameterAttribute to construct the attribute value. # we therefore have to look up which model the attribute actually lives on. backing_model, backing_name = backing_for_attribute(name) send("#{name}=", ActiveRecord::AttributeAssignment::MultiparameterAttribute.new(backing_model, backing_name.to_s, values_with_empty_parameters).read_value) else # ActiveRecord 5.0+: you can assign the indexed hash to the column and it will construct the value for you. if values_with_empty_parameters.each_value.all?(&:nil?) values = nil else values = values_with_empty_parameters end send("#{name}=", values) end rescue => ex errors << ActiveRecord::AttributeAssignmentError.new("error on assignment #{values_with_empty_parameters.values.inspect} to #{name} (#{ex.message})", ex, name) end end unless errors.empty? error_descriptions = errors.map(&:message).join(",") raise ActiveRecord::MultiparameterAssignmentErrors.new(errors), "#{errors.size} error(s) on assignment of multiparameter attributes [#{error_descriptions}]" end end
extract_callstack_for_multiparameter_attributes(pairs)
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# File lib/on_form/rails_compat.rb, line 47 def extract_callstack_for_multiparameter_attributes(pairs) attributes = {} pairs.each do |(multiparameter_name, value)| attribute_name = multiparameter_name.split("(").first attributes[attribute_name] ||= {} parameter_value = value.empty? ? nil : type_cast_attribute_value(multiparameter_name, value) attributes[attribute_name][find_parameter_position(multiparameter_name)] ||= parameter_value end attributes end
find_parameter_position(multiparameter_name)
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# File lib/on_form/rails_compat.rb, line 65 def find_parameter_position(multiparameter_name) multiparameter_name.scan(/\(([0-9]*).*\)/).first.first.to_i end
type_cast_attribute_value(multiparameter_name, value)
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# File lib/on_form/rails_compat.rb, line 61 def type_cast_attribute_value(multiparameter_name, value) multiparameter_name =~ /\([0-9]*([if])\)/ ? value.send("to_" + $1) : value end